Heating system enclosure



FIG. 1 is a top right front perspective view of a heating system enclosure.

FIG. 2 is a bottom left front perspective view thereof.

FIG. 3 is a front view thereof.

FIG. 4 is a rear view thereof.

FIG. 5 is a right side view thereof.

FIG. 6 is a left side view thereof.

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines shown in the views depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a heating system enclosure, as shown and described. 